JP2020094203A - Adhesion method - Google Patents

Abstract

To provide an adhesion method for adhering two adherends using a main adhesive agent containing a thermoplastic resin having a cross-linkable group and a catalyst.SOLUTION: An adhesion method for adhering two adherends using a main adhesive agent containing a thermoplastic resin having a cross-linkable group and a catalyst. The adhesion method includes the steps of: forming a main agent layer on one adherend; coating the main agent layer with the catalyst; laminating the main agent layer and the other adherend; and pressing the laminate in the thickness direction under heating. The adhesion method may take another way, for example, including the steps of: coating one adherend with a catalyst; forming a main agent layer on the coated face; laminating the other adherend on the face on which the main agent layer is formed; and pressing the laminate in the thickness direction under heating.SELECTED DRAWING: None

Description

The present invention relates to an adhesive method for adhering two adherends using an adhesive main agent containing a thermoplastic resin having a crosslinkable group.

Conventionally, various adhesives have been used to bond various adherends. Further, a hot melt adhesive (see, for example, Patent Document 1), a water-based adhesive, a solvent-based adhesive, or the like is selected depending on the material of the adherend, the use of the bonded body, etc. A synthetic resin or the like, which is the main agent of the agent, is selected. Further, the adhesive is appropriately selected and used depending on the method of applying it to the adherends, the temperature and pressure when joining the adherends, the pot life, the open time, and the like.

In addition, among the various adhesives described above, the hot melt adhesive has a solid content in almost all amount, and the transportation efficiency is extremely high. On the other hand, many water-based adhesives and solvent-based adhesives have a solid content of at most about 50% by mass and have low transportation efficiency. Further, the solvent-based adhesive has a problem that the organic solvent evaporates in a drying step after being applied to the adherend, which is not preferable in terms of environment.

JP, 2010-23694, A

The hot-melt adhesive has a high transportation efficiency and has no environmental problem due to the organic solvent, and is a preferable adhesive from this viewpoint. Further, there are a reactive type and a non-reactive type in the hot-melt adhesive, and in the reactive type, it functions as an adhesive by curing a reaction-curable base material. Therefore, if the pot life is lengthened, it takes a long time to cure, and the pot life and the curing time tend to be in conflict with each other.

On the other hand, in the non-reactive type, the molten thermoplastic resin or the like functions as an adhesive by solidifying. Further, in the non-reactive type, a melted adhesive is applied to the adherend, but the melted adhesive is often a melted thermoplastic resin and has an extremely high melt viscosity. Therefore, the application method is limited, such as applying the resin melted by an extruder or the like to the adherend. Further, in order to obtain a joined body having high heat resistance, it is necessary to use a thermoplastic resin having a high melting point, but in this case, after applying an adhesive to one adherend, the other one should be used as quickly as possible. The adherends must be joined. That is, the open time becomes shorter, and the heat resistance of the adhesive and the open time tend to be in conflict with each other.

The present invention has been made in view of the circumstances of the above-mentioned conventional technology, and a reaction type hot melt adhesive for contacting a catalyst to a main agent layer or a main agent film containing an adhesive main agent and permeating the same is used to achieve desired adhesion. An object of the present invention is to provide an adhesion method capable of shortening the curing time until the strength is developed.

The present invention is as follows.
1. A bonding method for bonding two adherends using an adhesive main agent containing a thermoplastic resin having a crosslinkable group and a catalyst for promoting the formation of crosslinks derived from the crosslinkable group,
A main agent layer forming step of forming a main agent layer made of the adhesive main agent,
And a catalyst contact step of bringing the catalyst into contact with the surface of the main agent layer and allowing the catalyst to permeate.
2. A main agent layer forming step of forming the main agent layer on the adhered surface of one adherend,
A step of applying the catalyst to the main agent layer,
A laminating step of laminating the one adherend and the other adherent so that the catalyst-attached main agent layer and the adherend surface of the other adherend are in contact with each other,
A heating and pressurizing step of heating the obtained laminated body to apply pressure in the layer thickness direction. Adhesion method described in.
3. A catalyst applying step of applying the catalyst to the adherend surface of one adherend,
A main agent layer forming step of forming the main agent layer on the coated surface coated with the catalyst,
A laminating step of laminating the one adherend and the other adherent so that the catalyst-attached main agent layer and the adherend surface of the other adherend are in contact with each other,
A heating and pressurizing step of heating the obtained laminated body to apply pressure in the layer thickness direction. Adhesion method described in.
4. A main agent layer forming step of forming the main agent layer on the adhered surface of one adherend,
On the adherend surface of the other adherend, a catalyst applying step of applying the catalyst,
A laminating step of laminating the one adherend and the other adherent so that the main agent layer and the catalyst coating surface of the other adherend are in contact with each other,
A heating and pressurizing step of heating the obtained laminated body to apply pressure in the layer thickness direction. Adhesion method described in.
5. A main agent film forming step of forming a main agent film composed of the adhesive main agent,
A step of applying the catalyst to at least one surface of the main agent film,
A laminating step of laminating the base material film with a catalyst between the two adherends,
A heating and pressurizing step of heating the obtained laminated body to apply pressure in the layer thickness direction. Adhesion method described in.
6. A main agent film forming step of forming a main agent film composed of the adhesive main agent,
A catalyst applying step of applying the catalyst to an adherend surface of at least one adherend of the two adherends;
A laminating step of laminating so that the main agent film is arranged between the two adherends, at least one of which has a catalyst;
A heating and pressurizing step of heating the obtained laminated body to apply pressure in the layer thickness direction. Adhesion method described in.
7. When the solubility parameter of the adhesive main agent is SP ₁ and the solubility parameter of the catalyst is SP ₂ , |SP ₁ −SP ₂ |≦5 is satisfied. Through 6. The bonding method according to any one of 1.
8. 1. The above 1. wherein the catalyst is a compound having a molecular weight of 500 or less. Through 7. The bonding method according to any one of 1.
9. 1. In which the catalyst is an amine compound. Through 8. The bonding method according to any one of 1.
10. The amine compound is bis-(2-dimethylaminoethyl)ether, N,N,N′,N′-tetramethylhexamethylenediamine, 1-methyl-4′-(dimethylaminoethyl)piperazine, N,N, 8. The above 9, which is at least one of N',N'-tetramethylethylenediamine and N,N-dimethyldodecylamine. Adhesion method described in.
11. 1. The thickness of the main agent layer is 10 to 500 μm. Through 10. The bonding method according to any one of 1.
The unit of the solubility parameter (SP value) is (cal/cm ³ ) ^1/2 .

According to the adhesion method of the present invention, when the main agent layer or the main agent film containing the thermoplastic resin having a crosslinkable group and the catalyst are brought into contact with each other, adhesiveness is developed in the main agent layer or the main agent film, so that two adherends are adhered to each other. Can be glued.

When |SP ₁ −SP ₂ |≦5 is satisfied when the solubility parameter of the adhesive main agent is SP ₁ and the solubility parameter of the catalyst is SP ₂ , the catalyst is added to the main agent layer or the main agent film containing the adhesive main agent. Penetrates more easily.
Furthermore, when the catalyst is a compound having a molecular weight of 500 or less, the catalyst is evenly permeated and diffused into the main agent layer or the main agent film containing the adhesive main agent, so that the adhesive layer can be formed more easily.
Further, when the catalyst is an amine compound, a compound having a small molecular weight can be easily selected, and there are wide choices of catalysts that can be easily permeated into the main agent layer or the main agent film containing the adhesive main agent.
Further, when the amine compound is at least one of the above-mentioned various compounds, it can be easily permeated as a catalyst into a main agent layer or a main agent film having a particularly low molecular weight and containing an adhesive agent.
Further, when the thickness of the main agent layer or the main agent film is 10 to 500 μm, it is easier to permeate and diffuse the catalyst when brought into contact with the catalyst, and a bonded body having sufficient adhesive strength is obtained. be able to.

Hereinafter, the present invention will be described in detail.
The matters shown here are for illustrative purposes and for exemplifying the embodiments of the present invention. The purpose of the present invention is to provide what is believed to be the most effective and effortless understanding of the principles and conceptual features of the present invention. In this respect, it is not intended to present structural details of the invention more than necessary for a fundamental understanding of the invention, and the following description may actually represent some aspects of the invention. It will be clear to a person skilled in the art how it is embodied in.

[1] Adhesion method The adhesion method of the present invention comprises a main agent layer forming step of forming a main agent layer made of an adhesive main agent containing a thermoplastic resin having a crosslinkable group, and a catalyst for promoting the formation of crosslinks derived from the crosslinkable group. And a catalyst contacting step of bringing the surface of the main agent layer into contact with the catalyst and causing the catalyst to permeate.

Further, more specific bonding methods include the following bonding methods (1) to (5).
Form (1): a step of forming a main agent layer on the surface of one adherend, a step of applying a catalyst to the main agent layer, and a step of bringing the main agent layer and the other adherend into surface contact were obtained. A step of heating the laminated body and pressing it in the layer thickness direction.
Form (2): a step of applying a catalyst to one adherend, a step of forming a main agent layer on the application surface, a step of bringing the other adherend into surface contact with the surface of the main agent layer, and the obtained laminate Heating the body and pressurizing it in the layer thickness direction.
Form (3): a step of forming a main agent layer on the surface of one of the adherends, a step of applying a catalyst to the other adherend, and two surface-contacts of the adherends between the main agent layer and the catalyst-coated surface. And a step of heating the obtained laminated body and pressurizing it in the layer thickness direction.
Form (4): a step of forming a main agent film made of an adhesive main agent, a step of applying a catalyst to the main agent film, a step of disposing the main agent film between two adherends, and the obtained laminate. Heating and pressurizing in the layer thickness direction.
Form (5): a step of forming a main agent film made of an adhesive main agent, a step of applying a catalyst to the adherend, a step of disposing the main agent film between two adherends, and the obtained laminate. And heating and pressurizing in the layer thickness direction.

As described above, in the forms (1) to (3), the main agent layer is formed on the adherend surface or the catalyst-coated adherend surface. On the other hand, in the forms (4) and (5), the main agent film serving as the main agent layer is formed, and the main agent film is laminated so as to be disposed between the two adherends. In addition, in the forms (2) and (3), the catalyst may be further applied to the main agent layer while taking into consideration the total application amount of the catalyst and the like. Further, in the form (4), the catalyst may be applied on only one surface of the main agent film or on both surfaces while taking into consideration the total application amount and the like. Further, in the form (5), the catalyst may be applied only to one of the two adherends, or to one and the other adherends while taking into consideration the total coating amount and the like. You may.

The method for applying the adhesive main agent to form the main agent layer on the adhered surface of the adherend, or the adhered surface of the adherend coated with the catalyst is not particularly limited, and a roll coater, a bar coater, a wire bar Examples of the coating method include a coater and a curtain flow coater. Further, the main agent film is a sheet-like material containing an adhesive main agent using an extrusion molding machine or the like, after extrusion molding to a film surface having poor adhesiveness such as polytetrafluoroethylene, solidified, and then the main agent film and the film. Can be formed by a method such as peeling.

Furthermore, the method of applying the catalyst to the surface of the main agent layer or the main agent film, and the adhered surface of the adherend is not particularly limited, and a spray method such as a scatter method or an air spray can be used, and a brush is applied. It may be.

In the bonding methods of the forms (1) to (5), the main agent layer or the main agent film is formed, then the main agent layer, the main agent film or the adherend is brought into contact with the catalyst, and then the laminate is formed, and The laminated body is heated and pressed to produce a joined body. In such a step, in addition to the curing of the adhesive main agent due to a decrease in temperature, the crosslinking reaction is promoted by the contact with the catalyst, and the curing further proceeds. Therefore, after the main agent layer or the main agent film is formed, there is a limitation in the time until the material is interposed between the two adherends, heated, pressurized, and bonded, that is, the open time.

When the open time is short, the formation of the main agent layer or the main agent film, the lamination of adherends, the heating of the laminated body, and the pressurization all have to be performed at predetermined locations. The formed adherend or the formed main agent film cannot be transferred to another place and then laminated, heated, or pressed. For these reasons and the like, the open time is preferably at least 2 hours or more, particularly about 4 hours.

Further, the adhesive main agent in the applicator is applied to the adherend surface of the adherend or the adherend surface of the adherend on which the catalyst is applied, the time until the main agent layer or the main agent film is formed, that is, the pot life. There is also a limit, and there is a time limit that considers the pot life as well as the open time.

Further, after the laminate is heated and pressurized, the time until the adhesive strength such as the desired peel strength is developed, that is, the curing time is not particularly limited, but from a practical viewpoint in the industrial aspect, The shorter the time, the better. This curing time generally requires a long time if the main agent layer and the main agent film to be the main agent layer are long, and may be short if the main agent layer is thin. For example, when the thickness of the main agent layer and the thickness of the main agent film are 10 to 500 μm, particularly 70 to 200 μm, and further 70 to 150 μm, the curing time is 240 hours or less, particularly 150 hours or less, and further 120 hours or less. preferable.

[2] Adhesive Base Agent The adhesive base agent contains a thermoplastic resin having a crosslinkable group. Examples of the crosslinkable group include an alkoxysilyl group, an oxazoline group, an acid anhydride group and a carbodiimide group. Of these, an alkoxysilyl group having a small binding force is preferable. Examples of the alkoxysilyl group include a trimethoxysilyl group, a methyldimethoxysilyl group, a dimethylmethoxysilyl group, a triethoxysilyl group, a methyldiethoxysilyl group and a methylmethoxyethoxysilyl group. Of these, a trimethoxysilyl group, a methyldimethoxysilyl group, and the like are preferable from the viewpoint of the curing speed and the like.

Further, the thermoplastic resin preferably has a skeleton of polyolefin, polyurethane, acrylic resin or the like. In the case of polyolefin, it may be either a homopolymer or a copolymer, and examples of the olefin as the skeleton thereof include ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-pentene, 4-methyl- Examples thereof include olefin monomers such as 1-pentene, 3-methyl-1-butene, 1-hexene and 1-octene. The polyolefin having a crosslinkable group is preferably a polymer of these olefin monomers to which a crosslinkable group such as alkoxysilane is bonded.

As the olefin homopolymer, polyethylene and polypropylene are frequently used, and as the copolymer, ethylene and 1-butene, propylene, 1-hexene, 1-octene, 4-methyl-1-pentene, or the like is used. A copolymer is mentioned. Further, a copolymer of ethylene and propylene is often used as the copolymer, and there are a random copolymer and a block copolymer, but the block copolymer is preferable from the viewpoint of excellent impact resistance. .. These polyolefins may be used alone or in combination of two or more.

The thermoplastic resin having a crosslinkable group is preferably a polyolefin having an alkoxysilyl group. In this case, the content in the adhesive main agent is not particularly limited, and when the adhesive main agent is 100% by mass, preferably 10% by mass or more (may be 100% by mass), more preferably 30% by mass or more. , Particularly preferably 40% by mass or more.

[3] Catalyst The catalyst that promotes the formation of crosslinks derived from the crosslinkable group can be appropriately selected and used according to the types of the crosslinkable group and the thermoplastic resin. For example, when the crosslinkable group is an alkoxysilyl group and the thermoplastic resin is a polyolefin, examples of the catalyst that promotes the formation of siloxane crosslinks derived from the alkoxysilyl group include amine compounds and metal catalysts. Examples of the amine compound include a monoamine compound, a diamine compound, a triamine compound, a cyclic amine compound, an alcohol amine compound, an ether amine compound, and hydroxylation or amination so that a part of the structure in these compounds reacts with polyisocyanate. The reactive amine-based compound or the like thus obtained can be used.

Specific examples of the amine compound include, for example, methanolamine, ethanolamine, propanolamine, N-methylmethanolamine, N-methylethanolamine, N-methylpropanolamine, N,N-dimethylmethanolamine, N,N-. Dimethylethanolamine, N,N-diethylethanolamine, N,N-dipropylethanolamine, N,N-dimethylbutanolamine, N,N-diethylbutanolamine, N,N-dipropylbutanolamine, N-(amino Methyl)methanolamine, N-(aminomethyl)ethanolamine, N-(aminomethyl)propanolamine, N-(aminoethyl)methanolamine, N-(aminoethyl)ethanolamine, N-(aminoethyl)propanolamine, etc. Is mentioned.

Also, triethylamine, N,N-dimethylcyclohexylamine, triethylenediamine, tetramethylguanidine, N,N-dipolyoxyethylenestearylamine, N,N'-dimethylpiperazine, N-methyl-N'-(2-dimethylamino )-Ethylpiperazine, N-methylmorpholine, N-ethylmorpholine, N-(N',N'-dimethylaminoethyl)-morpholine, 1,2-dimethylimidazole and the like can be mentioned. The catalysts composed of these amine compounds may be used alone or in combination of two or more.

Further, as the amine compound, various exemplified compounds can be used, but as the amine compound, a tertiary amine is preferable, and a substituent bonded to the nitrogen atom of the tertiary amine is preferably a methyl group, and a polyamine is preferable. .. Examples of such amine compounds include bis-(2-dimethylaminoethyl)ether (SP value; 8.1, molecular weight; 160.0), N,N,N',N'-tetramethylhexamethylene. Diamine (SP value; 8.0, molecular weight; 172.3), 1-methyl-4′-(dimethylaminoethyl)piperazine (SP value; 8.9, molecular weight; 171.3), N,N-dimethyldodecyl Amine (SP value; 8.0, molecular weight; 213.4), N,N',N"-tris(3-dimethylaminopropyl)hexahydro-s-triazine (SP value; 8.9, molecular weight; 342.6) ) And the like.

Examples of the metal catalyst include organic metal compounds such as carboxylates of metals such as tin, zinc, iron, lead, cobalt and titanium. These may be used alone or in combination of two or more.

Further, the coating amount of the catalyst can be set in consideration of the type of polyolefin, the type or bonding amount of alkoxysilyl groups, the type of catalyst, and the adhesive strength such as the desired peel strength. The coating amount of the catalyst is usually preferably 0.1 to 5.0% by mass, particularly preferably 0.5 to 2.0% by mass, when the total amount of the polyolefin and the catalyst is 100% by mass. If the coating amount of the catalyst is less than 0.1% by mass, siloxane crosslinks may not be sufficiently formed and desired adhesive strength such as peel strength may not be exhibited. There is no point in applying more than the required amount.

The catalyst is applied to the main agent layer containing the adhesive main agent, the main agent film serving as the main agent, or the adherend surface of the adherend, in any case, after the catalyst contacts the main agent layer or the main agent film, It is preferable that it penetrates quickly and evenly and diffuses. As described above, in order to quickly and evenly permeate and diffuse the catalyst into the main agent layer or the main agent film, the absolute value of the difference between the solubility parameter SP value of the adhesive main agent and the SP value of the catalyst is preferably small. ..

When the solubility parameter of the adhesive main agent is SP ₁ and the solubility parameter of the catalyst is SP ₂ , the absolute value of the SP value difference is preferably |SP ₁ −SP ₂ |≦5, more preferably |SP ₁ −. SP ₂ |≦4, more preferably |SP ₁ -SP ₂ |≦3, and particularly preferably |SP ₁ -SP ₂ |≦2.
The SP value is a value calculated by the method described in the Fedors method (Polymer Engineering and Science, February, 1974, Vol. 14, No. 2 P. 147 to 154).

Further, the smaller the molecular weight of the catalyst, the easier the diffusion. Therefore, it is preferable that the molecular weight of the catalyst is small as long as the function as the catalyst is not deteriorated. The molecular weight of the catalyst depends on the kind of the catalyst, but is preferably 500 or less, more preferably 320 or less, still more preferably 270 or less, and particularly preferably 230 or less. Further, the molecular weight of the catalyst is preferably 35 or more, more preferably 55 or more, even more preferably 80 or more, particularly preferably 100 or more. With the catalyst having a molecular weight in such a range, the catalyst is evenly permeated into the main agent layer or the main agent film containing the adhesive main agent and is easily diffused, and a homogeneous adhesive layer can be formed more easily. However, a catalyst that has a low boiling point and that quickly evaporates after being applied to a main agent layer containing an adhesive main agent is usually preferably used in a use environment (for example, a pressure environment) in which volatilization is suppressed.

As described above, the catalyst is preferably a catalyst having a solubility parameter having a small difference from the solubility parameter of the adhesive main agent and having a small molecular weight. The solubility parameter (SP ₂ ) of the catalyst depends on the kind of the adhesive main agent, but is usually 5 to 14, preferably 5 to 12, more preferably 6 to 11, still more preferably 6 to 10.5, particularly preferably. It is 7 to 9.5. With a catalyst having such a solubility parameter, it is possible to easily select a catalyst having a small difference from the solubility parameter of the polyolefin having a crosslinkable group which is frequently used and having excellent performance.

The thicknesses of the main agent layer and the main agent film serving as the main agent layer can be appropriately set depending on the type of adherend, the intended use of the joined body, and the like, for example, 20 to 500 μm, particularly 50 to 300 μm, and further 70 It can be set to ˜200 μm. Furthermore, the thicknesses of the main agent layer and the main agent film to be the main agent layer also need to be set in consideration of the open time and the time required to develop the adhesive strength such as the desired peel strength, that is, the curing time. ..

[4] Adherents The two adherends are not particularly limited, and various adherends can be used. As the adherend, for example, fabric, natural leather, synthetic leather, thermoplastic resin sheet, or the like can be used. Fibers used for fabrics such as fabrics, woven fabrics and knits include natural fibers such as cotton, hemp, wool and silk, regenerated fibers such as cupra and rayon, semi-synthetic fibers such as acetate, polyester fibers, acrylic fibers, Examples thereof include synthetic resin fibers such as polyamide fibers and polyolefin fibers, composite fibers using these fibers, and blended cotton.

Further, the thermoplastic resin used to form the thermoplastic resin sheet is not particularly limited, and a resin that can be molded into a sheet by extrusion molding, injection molding, or the like is preferable. For example, polyolefin resin, polyamide resin, polyester resin, polyacrylic resin and the like can be mentioned.

[5] Use of bonded body The bonded body formed by the bonding method of the present invention can be used in a wide range of product fields such as vehicle-related fields and construction-related fields. In the vehicle-related field, it is suitable as an interior material, exterior material, structural material, etc. of a vehicle. For example, it is used as a door trim, a pillar garnish, a seat back board, a roof trim, an instrument panel, a console box, a dashboard and a deck trim. Further, it can be similarly used in various transportation means and transportation means such as railway cars, ships and airplanes.

In the field of construction, it is suitable as an interior material, exterior material, structural material, etc. of various buildings. For example, it is used as a door covering material, a door structure material, a covering material for various furniture (desks, chairs, shelves, chests, etc.), and a structural material.

Test example (Diffusion of catalyst into the main agent layer containing the adhesive main agent, evaluation of permeability)
A polyolefin having an alkoxysilyl group having an SP value of 8.0 is used as an adhesive main agent, and a main agent film having a thickness of 600 μm is formed. After 16 hours, (1) SP value 8.0, molecular weight 172 is used as a catalyst. .3 N,N,N',N'-tetramethylhexamethylenediamine, (2)SP value 8.9, 1-methyl-4'-(dimethylaminoethyl)piperazine having a molecular weight of 171.3, and (3 ) SP value of 8.9 and molecular weight of 631.6, dibutyldilaurate tin were applied so that the application amount of each was 35 g/m ² .

After curing for 72 hours after application, the thickness of the cured adhesive main agent was evaluated by the imaging infrared spectrophotometer, where the catalyst penetrated and diffused. As a result, the catalyst (1) has a thickness of approximately 500 μm from the surface of the main agent film, the catalyst (2) has a thickness of approximately 500 μm from the surface of the main agent film, and the catalyst (3) has a thickness of approximately 200 μm from the surface of the main agent film. Had been cured to the thickness of. As described above, it can be seen that all the catalysts have sufficient performance when the thickness of the main agent layer in the product (joined body) is 100 μm. When the catalyst was not applied, it did not cure at all for 72 hours of curing, but when left standing for 1 month, it cured over the entire thickness by the action of the moisture curing reaction.

Example 1
As the two adherends, a polypropylene sheet having a thickness of 20 mm and a polyolefin-based elastomer sheet having a thickness of 25 mm were used. Among these, an adhesive (made by H. B. Fuller, trade name, containing a modified polyolefin resin having an SP value of 8.0 and having an alkoxysilyl group on the adhered surface of the polyolefin-based elastomer sheet by a roll coater. “Swiftlock 2003”) was applied under the conditions of a temperature of 150° C. and a coating amount of 100 g/m ² to form a main agent layer having a thickness of 100 μm. Then, after 30 minutes, the catalyst (1) in the above test example was applied as a catalyst to the surface of the main agent layer by air spray so as to be even in the plane direction so that the application amount was 0.1 g/m ² . .. In addition, 30 minutes after applying the catalyst, a polypropylene sheet heated to 80° C. and a polyolefin-based elastomer sheet having a base material layer formed thereon heated to 100° C. are laminated and pressed at a pressure of 0.1 MPa for 15 seconds. Tightened to obtain a bonded sheet. Then, after curing for 100 hours, the 180° peel strength was measured at a tensile speed of 200 mm/min according to JIS K 6854-2 (peeling strength under 100° C.). As a result, it was a sufficient strength of 8.4 N/25 mm.

Example 2 and Comparative Example 1
In the same manner as in Example 1 except that the catalyst (2) in the above test example was used instead of the catalyst (1), the catalyst (2) was applied to the surface of the main agent layer, and two catalysts were applied under the same conditions. The bonding material was laminated, pressed and cured to obtain the joining sheet of Example 2. Then, the peel strength was measured. As a result, the strength was 7.9 N/25 mm, which was a sufficient strength. On the other hand, two adherends were laminated, pressed and cured in the same manner as in Example 1 except that the catalyst was not applied, to obtain a joint sheet of Comparative Example 1. Then, the peel strength was measured and found to be 5.4 N/25 mm, which was inferior.

It should be noted that the above description is merely for the purpose of explanation and should not be construed as limiting the present invention. Although the present invention has been described in terms of exemplary embodiments, it is understood that the phraseology used in the description of the invention is illustrative and exemplary rather than limiting. Changes may be made, within the purview of the appended claims, as set forth herein without departing from the scope or spirit of the invention in its form. Although specific structures, materials and embodiments have been referred to in the specification of the invention herein, it is not intended that the invention be limited to the disclosure herein, rather, the invention is defined by the appended claims. It shall cover all functionally equivalent structures, methods and uses within the scope.

The bonding method of the present invention can be used in various technical fields. Specifically, it is suitably used in a technical field involving a joined body used in various industries such as interior materials for vehicles such as automobiles and railway vehicles, exterior materials, interior materials for aircraft, ships, buildings, exterior materials, etc. be able to.

Claims (11)

A bonding method for bonding two adherends using an adhesive main agent containing a thermoplastic resin having a crosslinkable group and a catalyst for promoting the formation of crosslinks derived from the crosslinkable group,
A main agent layer forming step of forming a main agent layer made of the adhesive main agent,
And a catalyst contacting step of bringing the catalyst into contact with the surface of the main agent layer and allowing the catalyst to permeate the surface of the main agent layer. A main agent layer forming step of forming the main agent layer on the adhered surface of one adherend,
A step of applying the catalyst to the main agent layer,
A laminating step of laminating the one adherend and the other adherend so that the catalyst-attached main agent layer and the adherend surface of the other adherend are in contact with each other,
The heating method of heating the obtained laminated body and pressurizing it in a layer thickness direction, The bonding method of Claim 1. A catalyst applying step of applying the catalyst to the adherend surface of one adherend,
A main agent layer forming step of forming the main agent layer on the coated surface coated with the catalyst,
A laminating step of laminating the one adherend and the other adherend so that the catalyst-attached main agent layer and the adherend surface of the other adherend are in contact with each other,
The heating method of heating the obtained laminated body and pressurizing it in a layer thickness direction, The bonding method of Claim 1. A main agent layer forming step of forming the main agent layer on the adhered surface of one adherend,
On the adherend surface of the other adherend, a catalyst applying step of applying the catalyst,
A laminating step of laminating the one adherend and the other adherend so that the main agent layer and the catalyst coating surface of the other adherend are in contact with each other,
The heating method of heating the obtained laminated body and pressurizing it in a layer thickness direction, The bonding method of Claim 1. A main agent film forming step of forming a main agent film composed of the adhesive main agent,
A step of applying the catalyst to at least one surface of the main agent film,
A laminating step of laminating the base material film with a catalyst between the two adherends,
The heating method of heating the obtained laminated body and pressurizing it in a layer thickness direction, The bonding method of Claim 1. A main agent film forming step of forming a main agent film composed of the adhesive main agent,
A catalyst applying step of applying the catalyst to an adherend surface of at least one adherend of the two adherends;
A laminating step of laminating so that the main agent film is arranged between the two adherends, at least one of which has a catalyst;
The heating method of heating the obtained laminated body and pressurizing it in a layer thickness direction, The bonding method of Claim 1. 7. When the solubility parameter of the adhesive main agent is SP ₁ and the solubility parameter of the catalyst is SP ₂ , |SP ₁ −SP ₂ |≦5 is satisfied, according to any one of claims 1 to 6. Bonding method. The adhesion method according to any one of claims 1 to 7, wherein the catalyst is a compound having a molecular weight of 500 or less. The bonding method according to any one of claims 1 to 8, wherein the catalyst is an amine compound. The amine compound is bis-(2-dimethylaminoethyl)ether, N,N,N′,N′-tetramethylhexamethylenediamine, 1-methyl-4′-(dimethylaminoethyl)piperazine, N,N, The bonding method according to claim 9, wherein the bonding method is at least one of N',N'-tetramethylethylenediamine and N,N-dimethyldodecylamine. The bonding method according to claim 1, wherein the base material layer has a thickness of 10 to 500 μm.